Question

Can someone please help me ;-;

Answer 1

$\Delta\ \textgreater \ 0\\\\ \Delta=m^2-4\cdot2\cdot8=m^2-64\\ m^2-64\ \textgreater \ 0\\ m^2\ \textgreater \ 64\\ m\ \textgreater \ 8 \vee m\ \textless \ -8\\ m\in(-\infty,-8)\cup(8,\infty)$